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I've checked the cab hoses for cracks, nothing there. I've did a comparison test all cylinders are good.

I have two questions.

1. When I unplug the maf sensor is the engine suppose to stop running, because the sensor is good. When I unplug mine the engine still runs, and it's kinda hard to tell Whether or not tge sensor is affecting because its misfiring.

2. There's a exhaust leak from the gaskets , and kinda of think the o2 sensors are bad because t he code came once or twice .

Where should I start before I just start throwing parts at it . And we all know those German parts can get expensive.

Unplugging the MAF forces the engine computer (DME) into the open loop mode. The DME uses an overly rich fuel/air mix in this mode. This is the same mode whether DME uses when a cold engine is started. The DME does this to get the cats up to temperature quickly. Also, unplugging the MAF masks vacuum leaks.

Musfires can be caused sed by a myriad of issues. You need to check the fuel pressure. It needs to be at least 50psi. Item #18 in the link is the cap to the test valve.